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Which of the following statements is correct regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour?

1. Intermolecular attractive forces between A and B-B are equal to those between A-B.
2. Intermolecular attractive forces between A and B-B are stronger than those between A-B.
3. ΔmixH = 0 at constant T and P.
4. ΔmixV = 0 at constant T and P.

Correct answer: Intermolecular attractive forces between A and B-B are stronger than those between A-B.

Solution

Positive deviation from ideal behavior occurs when the intermolecular forces between A-B are weaker than those between A-A and B-B, leading to increased enthalpy and volume upon mixing.

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